Releasable work holding device



May 23, 1961 E. I Elss 2,985,459

RELEASABLE WORK HOLDING DEVICE Filed March l2, 1959 45 17j/:Q4 .Z if 55,ff j 25 3 M@ 54 25 20 25 2/ 45 2; 5 5 L/ML L g' LK. i'

United States Patent RELEASABLE VWOR-K HOLDING DEVICE `EmilLeiss,Ridgewood, NJ., assignorto Lever BiasMachine Corporation, New York, NX.,a corporation of ANew York Filed Mar. 12, 1959,'Ser."N0. 799,021

16 Claims. `(Cl. 2794-110) 'If'his invention relates to releasable workholding devices, and more particularly to rotary work holding delvicesor chucks of the type intended to be used yon `power-driven spindles, toreleasably grip irolls of work :orthe like.

.An yobject of the invention is -to provide afnovel and improvedreleasable work-*holdinglchuck'of Vthe type ar- ,ranged to grip vanddrive a -turnable workpiece or roll of work, wherein the work-engagingjaws may be easily and quickly actuated and adjusted tofengage lthe^workWith- .out yinvolving the use of special `tools yorother like in-.struments `A further object of the invention :is to providean improvedwork holding or engaging chuck in the .zform of a rotary holder or faceplate, wherein the jaw-'actuating means is conveniently disposed'at therear Yof the 'holder y.plate and arranged to be easily 4andqtlicklyoperated by hand.

-Another object of the invention is to provide a novel and improvedreleasable work-holding chuck as above characterized, which has severalsets of work-engaging jaws with one set arranged to grip the outside ofaroll of work and another `set adapted to engage and grip the inside ofthe work roll.

A feature of the linvention `resides in the Aprovision .of a novel'locking-type work-driving .chuck of the above character wherein thelocking means is extremely simple in Vits construction and yet whollyeffective .to securely 'lock the chuck in all of its various adjustedpositions.

Another feature of the invention resides in the provision of an improved.work-driving chuck Vdevice having multiple sets of jaws as outlined,wherein one of said sets has a relatively short or small travel and ispower- 'fully driven by simple, positive-acting cam and anti-.frictionmeans.

Yet another object of the invention is to provide an improved chuckdevice having multiple sets of jaws, wherein simple, coupled drivingmeans is employed for actuating yall the jaws, said driving meanseffecting .a positive retraction of vthose jaws having relatively ygreatmovement and permitting a spring-retraction of other `jaws which arerequired to have .only relatively little movement with the springretraction thereof .being unimpeded by the work.

Still another object of the invention is to provide an improved chuck ofthe above type, which is extremely compact in its construction and ofrelatively .small size whereby-it may be readily'accommodatedinlpower-driven .equipment without requiring appreciable space.

A `further object of the invention vis to provide a novel and improvedreleasable chuck device `having the vabove features and advantages yandwhich is nevertheless simple'to construct and economical-to fabricate.

Other features and vadvantages 'will hereinafter appear.

In the drawings accompanying thisspecication similar characters ofreference are used to designate like components throughout the Iseveral1views, which:

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2 Fig. 1 4is a fragmentary front elevational view of a powered slittingmachine employing theimproved chuck of the invention. y

Fig. 2 is an elevational view'looking lat the front face of the chuck,

Fig. 3 is a section taken on the line 3--3 of Fig. 2.

Fig. 4 is a fragmentary transverse sectional view'taken Yon the line 4-4of Fig. 3.

`Fig. 5 is a view partly in section and partly lin elevation, thesection being taken Yon the line 5--5 of Fig. 3.

Fig. 6 is a fragmentarysectional view Vsimilar'tothat shown in the lowerportion of Fig. 3, but illustrating different positions of the partswherein 'the inner set 'of jaws is shown as retracted.

`Fig. 7 is a fragmentary sectional view, taken on th'e line 7 7 of Fig.6.

Referring iirst to Fig. l there is illustrated "a portion of aroll-slitting machine y.of the type v'which is used for slitting rollsof fabric and the like, said machine vinzclu-ding a powered spindle '10`extending 'from a drive frame, thereby to eiect Va'support forthework'roll 1S at both ends thereof.

In accordance with the present invention the ydriving spindle 10 isprovided with a vnovel and improved'chuck `-device 20 which securelygrips one endof'the work roll 15 and reliably ydrives the same, saidchuck device being easily operated by hand both for the purposeof'gripping the work-roll 15 vand also releasing the llatter after theslitting of the roll has been completed, all without lrequiring the useof tools, special wrenches or the like.

The operation of the chuck device 20 is effected by a simple turningmovement imparted to an actuating knob 21 provided at the rear face orsurface vof the chuck, and upon the jaws of the chuck being properly setthey `may be readily locked in their adjusted positions by imparting aturning movement to ka second, Ylocking knob 22 also provided at the-rear :face or lsurface of the chuck. Further, in accordance with theinvention and referring to Figs. 2 and 3, the chuck device 2G isprovided with several sets of jaws arranged for engagement not only withthe outside of the vroll of work v15 but also with the vinside `or core14 normally provided therewith, thereby `to insure a reliable andaccurate :positioning and positive drive of the work roll -under alllconditions of use. The .outer set of jaws, -which are inwardly acting,is designated "generally by the numerals 25, whereas `the inner set ofjaws, lwhich are outwardly acting, is designated vgenerally by thenumerals 127.

-Both fsets of jaws 25, 27 tare-can'iedf'by a rotary holder rplate :orface plate which may be advantageously con- ;stituted .of `severalseparate components. As shown, the

having elongate slide portions 36, .said body members -be'ing 'carriedinradial T-.slots 3-7 provided in 'the holder plate L31. The 'slideportions 36 of the holder members are provided vwithteeth 38 4alongtheir 'edges for engageas clearly shown in Fig. 3.

3 ment with pinions 39 which are rotatably mounted on the holder plates29, 31 so that their axes are parallel with the axes of the said plates.

Moreover, in accordance with the invention, the pinions 39 are arrangedto have appreciable axial length and to additionally mesh with a largecentral gear 41 which is turnably carried by the holder plate 29 and iscoaxial therewith; by such organization all of the jaw body members 34are coupled for simultaneous movement, both in outward directions andalso in inward directions, such movement being in response to turninglof the gear 41 with respect to the holder plates 29, 31.

As seen in Figs. 2 and 3, the jaw holder members 34 may be provided withpointed pins 43, secured to the members in any suitable manner as by theset screws shown, the said pins being adapted for engagement with andimbedment in the outside layers of the Work roll 15 for the purpose ofimparting movement to the said roll.

By the present invention the operating knob 21 which is disposed at theback surface of the rotary holder plates 29, 31 is fixedly secured to ashaft 45 carrying one of the pinions 39, as seen in Figs. 3 and 4,thereby to enable the central large gear 41 to be readily actuated andturned, and consequently to enable the entire outer set of jaws 25 to bereadily adjusted both inwardly and outwardly without requiring the useof special tools, wrenches or the like. By virtue of the relativelysmall diameters of ythe pinions 39 the actuation of the set of jaws 25may be easily effected, in a quick and facile manner.

Further, in accordance with the invention, a novel and simplifiedlocking means is provided to securely retain the jaws of the outer set25 in their adjusted positions. This locking means comprises, in itssimplest form as shown, a single screw 47 having a knurledlinger-engageable head 48, the said screw being threaded into the rotaryholder plate 29 and arranged to directly engage the central gear 41 nearthe outer periphery thereof. It will be readily understood that when thelocking screw 47 is loose, the outer-set of jaws 25 may be readilyadjusted by turning the knob 21, and upon the work roll 15 boingproperly engaged by the pins 43 of the jaws, the said jaws may be lockedin their adjusted positions by tightening the locking screw 47,theretion with the outer set of work-engaging jaws 25 there is alsoprovided the additional and inner set of jaws 27 lwhich have arelatively small movement, being adapted to engage the inside of thecore 14 of the work roll 15 The inner set of jaws 27 is advanced ormoved outward by a positive drive means, said jaws however beingretracted or shifted inward by -spring action, thereby eiecting adesirable simplication of the actuating mechanism. Moreover, thepositive outward actuation of the second set of jaws 27 is elected by asimple and reliable anti-friction cam mechanism which renders theoperation of the chuck easy and foolproof.

Referring to Figs. 3, 5 and `6, the jaws of the inner set 27 are seen toeach comprise a lever 50 pivotally mounted in an elongate holder 51which is secured to the rotary holder plate 31 by suitable recessedfllister head screws 52. The lever-type jaws 50 have workengagingtapered arms 54 extending generally axially of the holder plates 29, 31,said arms being arranged to engage the Vinside of the core 14 of thework roll 15 as clearly shown in Fig. 3. Actuation of the levers 50,simultaneously with actuation with the outer set of Y jaws 25 iseffected by a cam-type transmission, involving La 'plurality of camsurfaces 56 disposed in one side of fthelarge central gear 41 andVarranged to engage antifriction balls 58 carried in recesses disposedin the holder plate 31, as seen in Figs. 3 and 6. The anti-frictionballs 58 engage transmission levers 60 which are pivotally mounted inthe holders 51, said levers engaging stiff arms 62 provided on the jaws50 as shown. The said jaws 50 also carry leaf springs 64 engageable withiixed pins 65 secured in the holders 51, thereby to provide acounterclockwise bias to the jaws 50l as seen in Figs. 3 and 6, thus toeffect retracting movement of said jaws so as to release the tubularcore 14 of the work roll 15.

Operation of the inner set of jaws 27 may now be readily understood.When the central gear 41 is turned in response to actuation of the knob21 for the purpose of actuating the outer set of jaws Z5, the camsurfaces 56 on the gear 41 will effect a counterclockwise turning of thetransmission levers 60 (from the position shown in Fig. 6 wherein `theinner jaws are retracted to the position of Fig. 3 wherein the innerjaws have been driven clockwise to their extended, work-grippingVpositions). Thus, not only is the roll 15 positively engaged at theouter layers of cloth by the sharp pins 43 of the outer set of jaws 25,but also the core 14 of thev roll is securely gripped by theexpanding-type inner jaws 50, thereby to effect a positive and reliabledrive of the work roll 15. Upon reverse turning of the actuating knob 21the cam surfaces 56 will relieve the inner jaws 50 of their clampingforces, and the said jaws will be returned to the retracted positions ofFig. 6 by the leaf springs 65 as the outer jaws 25 are retracted orshifted outward, all in response to turning of the large gear 41.

It will be understood that the locking screw 47 effects a locking of theinner jaws 50 as well as of the outer jaws '25 by virtue of securing thecentral gear 41 in its adjusted position.

It will now be seen that I have provided in accordance with the presentinvention a novel and improved chuck construction characterized by innerand outer, positivelyadvanced gripping jaws, together withspring-retracted inner jaws, the latter having relatively limitedmovement whereas the outer jaws have a fairlyV extensive movement.Moreover, the actuation and locking of the jaws may be easily andquicklyV effected manually without requiring the use of special tools,wrenches or the like, by merely turning-the actuating knob- 21 at therear plate of the holder plate, and locking the adjustment by turning ofthe locking screw 47 also located at the rear surface of said plate. Thechuck construction is seen to be extremely compact, and constituted ofrelative simple mechanical movements whereby a positive and reliableoperation is had at all times, in a construction which is relativelysmallV and easily incorporated in existing machine structures. The useof the antifriction transmission balls 58 and levers 60 provides asmooth operation of the inner jaws 50, further facilitating the use ofthe chuck. By virtue of the two sets of but also the inside of the core14 a roll is effected at all times.

Variations and modifications may be made within the scope of the claims,and portions of the improvements jaws, engaging not only the outerlayers of the roll 15 /4 positive drive of the ,may be used withoutothers.

I claim:

l. A chuck -for use with a power-driven spindle to releasably grip ahollow roll of work, comprising a rotary Vholder plate having means -formounting it on said spindle; a plurality ofrinwardly-acting jaws movablycarried-by said holder plate at the front thereof for engagating saidjaw-driving means, said manually engageable means further including apinion which is carried by the holder plate with its axis parallel tothe axis of the plate and is operatively connected with the turnableknob, said jaw driving means including a gear arranged coaxially on theholder plate and engaged by the said pinion to be driven thereby, andincluding racks associated with the jaws, and pinions drivingly engagedwith the racks and also with the said gear, one of said racks also beingengaged by the pinion which is operatively connected with the turnableknob.

2. The invention as dened in claim 1, in which the jaws include holdermembers having body portions of I-shaped cross section, said holdermembers being movable in T-slots in the holder plate, and said holdermembers having teeth constituting the said racks.

3. The invention as defined in claim 1, in which there is meansincluding a manually engageable member movably mounted at the rear ofthe holder plate, for locking the said jaw-driving means in its variousadjusted positions.

4. The invention as defined -in claim 3, in which the locking meanscomprises a threaded locking device actuatable by the locking member,for securing the gear in different adjusted positions.

5. The invention as dened in claim 4, in which the gear is carried in arecess in the holder plate, and in which the threaded locking devicecomprises a screw threaded in the holder plate and directly engaging thesaid gear.

6. A chuck for use with a power-driven spindle to releasably grip ahollow roll of work, comprising a rotary holder plate having means formounting it on said spindle; a plurality of inwardly-acting jaws movablycarried by said holder plate at the front thereof for engaging theoutside of a roll of work, said jaws being mounted for movement indirections toward and away from the center of the plate; jaw-drivingmeans for effecting simultaneous inward and outward movements of saidjaws; a plurality of outwardly-acting jaws movably carried at the frontof the holder plate -for engagement with the inside of a roll of work,said outwardly-acting jaws being mounted for movement in directionstoward and away from the center of the holder plate; and means coupledto the said jaw-driving means and responsive to movement thereof, foreffecting simultaneous outward movements of the outwardly-acting jawssimultaneously with inward movements of the inwardly-acting jaws andvice versa. Y

7. The invention as defined in claim 6, in which the 6 said jaw-drivingmeans includes a gear rotatably carried by the holder plate, and inwhich the means for eiecting simultaneous outward movements of theoutwardly acting jaws include cam elements operatively associated withthe said gear.

10. The invention as defined in claim 9, in which the outwardly actingjaws comprise transmission levers pivotally mounted on the holder plate,and in which the cam means includes cam followers operatively engagedwith the said levers.

11. The invention as defined in claim 9, in which the said jaw-drivingmeans comprises a gear rotatably mounted on the holder plate and coaxialtherewith, and in which the cam means comprises sloping cam surfacesprovided on the said gear.

12. The invention as deiined in claim 11, in which the cam meansincludes transmission levers operatively associated with the outwardlyacting jaws and arranged to be responsive to movement of the camsurfaces provided on the said gear.

13. The invention as dened in claim 9, in which the cam means includescam surfaces associated with the said jaw-driving means, and includesanti-friction balls engaged with the said cam surfaces.

14. The invention as defined in claim 13, in which the jaw-driving meansincludes a gear rotatably carried by the holder plate and coaxialtherewith, said gear being provided with the said cam surfaces.

15. The invention as defined in claim 6, in which there are spring meansbiasing the outwardly acting jaws in directions toward the center of theholder plate.

16. A chuck Afor use with a power-driven spindle to releasably grip ahollow roll of work, comprising a rotary holder plate having means formounting it on said spindle; a plurality of inwardly-acting jaws movablycarried by said holder plate at the front thereof for engaging theoutside of a roll of work, said jaws being mounted for movement indirections toward and away from the center of the plate; jaw-drivingmeans for effecting simultaneous inward and outward movements of saidjaws; and manually engageable means including a turnable Vknob disposedat the rear of the holder plate, for actuating said jaw-driving means; aplurality of outwardly-acting jaws movably carried at the front of theholder plate forA engagement with the inside of a roll of work, saidoutwardly-acting jaws being mounted for movement in directions towardand away from the center of the holder Y plate; and means coupled to thesaid jaw-driving means outwardly acting jaws comprise levers which arepivotally v mounted on the rotary holder plate, said levers having armsextending axially of the said plate and adapted for engagement with thevinside of the roll of work.

8. The invention as defined in claim 7, in which the said levers carryleaf springs biasing the levers in directions tending to shiftthe`workengaging arms thereof in directions toward the center of theholder plate.

9. The invention as defined in claim 6, in which the and responsive tomovement thereof, for eiecting simultaneous outward movements of theoutwardly-acting jaws simultaneously with inward movements of theinwardlyacting jaws and vice versa.

References Cited in the le of this patent UNITED STATES PATENTS i1,570,724 Beck Ian. 2.6, 1926 2,703,242 Sloan et al. Mar. 1, 19552,894,757 Schustack Iuly 14, 1959

